EP2516857A1 - Piston pump for a hydraulic vehicle braking system - Google Patents

Piston pump for a hydraulic vehicle braking system

Info

Publication number
EP2516857A1
EP2516857A1 EP10778914A EP10778914A EP2516857A1 EP 2516857 A1 EP2516857 A1 EP 2516857A1 EP 10778914 A EP10778914 A EP 10778914A EP 10778914 A EP10778914 A EP 10778914A EP 2516857 A1 EP2516857 A1 EP 2516857A1
Authority
EP
European Patent Office
Prior art keywords
shut
valve
piston pump
opening
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10778914A
Other languages
German (de)
French (fr)
Other versions
EP2516857B1 (en
Inventor
Heiko Jahn
Marc Zimmermann
Martin Juretko
Oliver Hennig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2516857A1 publication Critical patent/EP2516857A1/en
Application granted granted Critical
Publication of EP2516857B1 publication Critical patent/EP2516857B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/1007—Ball valves having means for guiding the closure member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0091—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using a special shape of fluid pass, e.g. throttles, ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F04B53/1017—Semi-spherical ball valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the invention relates to a piston pump for a hydraulic vehicle brake system having the features of the preamble of claim 1.
  • piston pumps are known from slip-controlled vehicle brake systems, they are also referred to as return pumps.
  • the known piston pump has a pump piston which can be driven in a pump bore to a reciprocating stroke movement.
  • a rotating drivable eccentric which is arranged at a front end of the pump piston and at the periphery of the pump piston rests with its front end.
  • the known piston pump has two spring-loaded check valves, one of which
  • Inlet valve and the other forms an outlet valve of the piston pump.
  • balls are as shut-off of the check valves.
  • one of the two non-return valves has a disc-shaped shut-off body, namely the inlet valve, which is arranged on an eccentric distal front end of the pump piston.
  • the piston pump according to the invention with the features of claim 1 has a spring-loaded check valve whose shut-off body has a damper body, with which it is movable.
  • a valve closing spring acts on the shut-off body together with the damper body against the valve seat.
  • the shut-off body is not rigidly connected to the damper body, but it is movable in the opening and closing direction relative to the damper body.
  • the damper body is received in a damper chamber, which may for example be a blind hole, from which it displaces fluid when opening the check valve.
  • the fluid is the fluid which is also conveyed by the piston pump, ie brake fluid in a hydraulic vehicle brake system.
  • the fluid may be displaced through one or more channels or through a gap between the damper body and a wall of the damper chamber.
  • the list is not exhaustive. The displacement of fluid by the damper body from the damper chamber when opening the check valve has the effect that an opening movement of the check valve is damped.
  • shut-off body aligns when closing the check valve on the valve seat, it is movable transversely to the opening and closing direction. It may be the shut-off against the damper body (claim 3) and / or the damper body with the shut-off transversely to the opening and closing direction to be movable (claim 4).
  • the check valve according to the invention is provided as an outlet valve of the piston pump (claim 8) and arranged at an eccentric end of a cylinder of the piston pump.
  • Figure 1 shows an axial section of a piston pump according to the invention
  • Figure 2 shows a modified embodiment of the piston pump of Figure 1 according to the invention
  • the inventive piston pump 1 is provided as a so-called. Return pump for a slip-controlled, hydraulic vehicle brake system. It has a pump piston 2 which is received in an axially displaceable manner in a cylinder 3. A protruding from the cylinder 3 front end of the pump piston 2 abuts a circumference of a rotatably driven eccentric 4, which drives the pump piston 2 reciprocating in the cylinder 3 reciprocating stroke movement when the eccentric 4 is driven to rotate. A piston spring 5, which is arranged in the cylinder 3, holds the pump piston 2 in contact with the circumference of the eccentric 4th
  • the cylinder 3 is introduced into a pump bore 6 in a pump housing 7, the pump bore 6 leads the pump piston 2 at a protruding from the cylinder 3, the eccentric end axially displaceable.
  • the piston pump 1 may have a separate pump housing 7.
  • the pump housing 7 is formed by a hydraulic block in which in addition to the piston pump 1 further hydraulic components such as solenoid valves of a slip control of the hydraulic vehicle brake system arranged and interconnected by holes hydraulically.
  • hydraulic blocks are known from slip-controlled vehicle brake systems and will not be explained further here.
  • An inlet 8 of the piston pump 1 takes place through a bore which intersects the pump bore 6 radially outside the cylinder 3. Further, the inlet 8 leads through intersecting radial bores 9 in an axial blind hole 10 in the pump piston 2.
  • An inlet valve 1 1 shown as a symbol in the drawing is integrated in the pump piston 2 or arranged at its front end located in the cylinder 3. The inlet valve 1 1 is a spring-loaded check valve.
  • the cylinder 3 has a bottom 12, on which the piston spring 5 is supported.
  • the bottom 12 has a center hole, which has a passage 13 of an outlet valve 14 of the piston pump 1 forms.
  • the exhaust valve 14 is arranged in a blind hole 15 of a cylinder head 16, which is placed on the bottom 12 of the cylinder 13.
  • the cylinder head 16 forms a valve housing of the exhaust valve 14.
  • the outlet valve 14 is a spring-loaded check valve with a mushroom-shaped shut-off body 17.
  • the shut-off body 17 has a head 18 with a spherical surface, which cooperates with a conical valve seat 19 which is formed at an opening of the passage 13 in the bottom 12 of the cylinder 3.
  • the shut-off 17 On a flat underside of the head 18, the shut-off 17 has a
  • the shaft 20 of the shut-off body 17 passes through a center hole 21 in an end wall 22 of a tubular damper body 23.
  • the shaft 20 of the shut-off body 17 of the outlet valve 14 has a smaller diameter than the central hole
  • shut-off body 17 is transverse to its opening and closing direction, d. H. radially to the cylinder 3, movable and aligns when closing the exhaust valve 14 on the valve seat 19. Any displacement of the passage 13 with the valve seat 19 with respect to the valve housing forming cylinder head 16 is compensated.
  • a valve closing spring 24 which is formed in the illustrated embodiment of the invention as a helical compression spring, acts on the damper body 23 and on this the shut-off 17 against the valve seat 19.
  • the valve closing spring 24 is supported on a bottom of the blind hole 15 in the cylinder head 16.
  • Damper body 23 moves with the shut-off 17, wherein the shut-off body 17 relative to the damper body 23 is movable.
  • the damper body 23 When opening the exhaust valve 14, the damper body 23 is pressed into the blind hole 15 in the cylinder head 16 and displaces brake fluid from the blind hole 15 by an annular gap 25 surrounding the damper body 23 in the blind hole 15.
  • the displacement of brake fluid from the blind hole 15 causes a damping
  • the blind hole 15 can be considered as a damper chamber 26, the damper body 23 as a damper piston 27 because of its the opening movement of the exhaust valve 14 in cooperation with the damper body 23 damping effect.
  • Brake fluid displaced by the outlet valve 14 from the piston pump 1 flows through radial outlet channels 28 into a ring line 29 and from there into an outlet 30, which opens radially into the pump bore 6 in the pump housing 6.
  • the annular channel 29 is enclosed between the cylinder 3 and the pump bore 6, it encloses the cylinder 3 near its outlet valve side
  • shut-off body 17 of the outlet valve 14 is not mandatory for the invention, the shut-off body may for example also have the shape of a hemisphere or ball or a disc.
  • Figure 2 shows a further alternative with a cylindrical shut-off body 31 which has a spherical end face 32 which cooperates with the conical valve seat 19 at the mouth of the passage 13 in the bottom 12 of the cylinder 3. When the outlet valve 14 is closed, the spherical end face 32 of the shut-off body 31 bears against the valve seat 19.
  • the shut-off body 31 is received in a tubular damper body 33, which can also be understood as a damper piston.
  • the shut-off body 31 is axially displaceable in the damper body 33, i. movable in the opening and closing direction. Radial, d. H. transverse to the opening and closing direction, the shut-off body 31 in the damper body 33, in contrast to Figure 1 is not movable. Radial, d. H. transverse to the opening and closing direction in Figure 2, however, the damper body 33 and together with it the shut-off body 31 movable by play in the blind hole 15 in the cylinder head 16, wherein the blind hole 15 forms a damper chamber 26 here.
  • the blind hole 15 has a larger one
  • the shut-off body 33 has one after inside standing radial flange 34 against which the valve closing spring 24 presses.
  • piston pump 1 of Figure 2 is the same design as the piston pump 1 of Figure 1 and works in the same way.
  • FIG. Matching components have the same reference numbers in both figures.
  • a conical valve seat 19 is not mandatory for the invention.
  • the valve seat may for example also be formed by a peripheral edge at the mouth of the passage 13 (not shown). The list is not exhaustive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Check Valves (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention relates to a piston pump (1) as a return pump of a slip-controlled, hydraulic vehicle braking system. According to the invention, there is a mushroom-shaped shut-off body (17) as a spring-loaded outlet valve (14), the shaft (20) thereof extending through a center hole (21) of a tubular damper piston (27). The shut-off body (17) is movable transversely to the opening and closing direction thereof, so that said shut-off body aligns with a valve seat (19) upon closing. Upon opening, the damper piston (27) forces brake fluid out of a damping chamber (25) in which it is housed so that an opening movement of the outlet valve (14) is dampened.

Description

Beschreibung  description
Titel title
Kolbenpumpe für eine hydraulische Fahrzeugbremsanlage Stand der Technik  Piston pump for a hydraulic vehicle brake system prior art
Die Erfindung betrifft eine Kolbenpumpe für eine hydraulische Fahrzeugbremsanlage mit den Merkmalen des Oberbegriffs des Anspruchs 1 . Derartige Kolbenpumpen sind von schlupfgeregelten Fahrzeugbremsanlagen bekannt, sie werden auch als Rückförderpumpen bezeichnet. The invention relates to a piston pump for a hydraulic vehicle brake system having the features of the preamble of claim 1. Such piston pumps are known from slip-controlled vehicle brake systems, they are also referred to as return pumps.
Eine derartige Kolbenpumpe offenbart die Offenlegungsschrift DE 10 2006 035 055 A1 . Die bekannte Kolbenpumpe weist einen Pumpenkolben auf, der in einer Pumpenbohrung zu einer hin- und hergehenden Hubbewegung antreibbar ist. Zum Antrieb dient ein rotierend antreibbarer Exzenter, der an einem Stirnende des Pumpenkolbens angeordnet ist und an dessen Umfang der Pumpenkolben mit seinem Stirnende anliegt. Such a piston pump disclosed in the published patent application DE 10 2006 035 055 A1. The known piston pump has a pump piston which can be driven in a pump bore to a reciprocating stroke movement. To drive a rotating drivable eccentric, which is arranged at a front end of the pump piston and at the periphery of the pump piston rests with its front end.
Zur Steuerung einer Durchströmungsrichtung von Bremsflüssigkeit weist die be- kannte Kolbenpumpe zwei federbelastete Rückschlagventile auf, deren eines einTo control a direction of flow of brake fluid, the known piston pump has two spring-loaded check valves, one of which
Einlassventil und deren anderes ein Auslassventil der Kolbenpumpe bildet. Üblich sind Kugeln als Absperrkörper der Rückschlagventile. Bei der bekannten Kolbenpumpe weist eines der beiden Rückschlagventile einen scheibenförmigen Absperrkörper auf, nämlich das Einlassventil, welches an einem exzenterfernen Stirnende des Pumpenkolbens angeordnet ist. Inlet valve and the other forms an outlet valve of the piston pump. Usually balls are as shut-off of the check valves. In the known piston pump, one of the two non-return valves has a disc-shaped shut-off body, namely the inlet valve, which is arranged on an eccentric distal front end of the pump piston.
Offenbarung der Erfindung Disclosure of the invention
Die erfindungsgemäße Kolbenpumpe mit den Merkmalen des Anspruchs 1 weist ein federbelastetes Rückschlagventil auf, dessen Absperrkörper einen Dämpferkörper aufweist, mit dem zusammen es beweglich ist. Bei einem Öffnen des Rückschlagventils wird der Absperrkörper von einem Ventilsitz des Rückschlagventils abgehoben und der Dämpferkörper bewegt sich mit dem Absperrkörper mit. Zum Schließen beaufschlagt eine Ventilschließfeder den Absperrkörper zusammen mit dem Dämpferkörper gegen den Ventilsitz. Der Absperrkörper ist nicht starr mit dem Dämpferkörper verbunden, sondern er ist in Öff- nungs- und Schließrichtung gegenüber dem Dämpferkörper beweglich. Der Dämpferkörper ist in einer Dämpferkammer aufgenommen, die beispielsweise ein Sackloch sein kann, aus der er beim Öffnen des Rückschlagventils Fluid verdrängt. Das Fluid ist das Fluid, das auch von der Kolbenpumpe gefördert wird, bei einer hydraulischen Fahrzeugbremsanlage also Bremsflüssigkeit. Das Fluid kann beispielsweise durch einen oder mehrere Kanäle oder durch einen Spalt zwischen dem Dämpferkörper und einer Wand der Dämpferkammer verdrängt werden. Die Aufzählung ist nicht abschließend. Die Verdrängung von Fluid durch den Dämpferkörper aus der Dämpferkammer beim Öffnen des Rückschlagventils hat die Wirkung, dass eine Öffnungsbewegung des Rückschlagventils gedämpft wird. The piston pump according to the invention with the features of claim 1 has a spring-loaded check valve whose shut-off body has a damper body, with which it is movable. When opening the Check valve, the shut-off of a valve seat of the check valve is lifted and the damper body moves with the shut-off with. To close a valve closing spring acts on the shut-off body together with the damper body against the valve seat. The shut-off body is not rigidly connected to the damper body, but it is movable in the opening and closing direction relative to the damper body. The damper body is received in a damper chamber, which may for example be a blind hole, from which it displaces fluid when opening the check valve. The fluid is the fluid which is also conveyed by the piston pump, ie brake fluid in a hydraulic vehicle brake system. For example, the fluid may be displaced through one or more channels or through a gap between the damper body and a wall of the damper chamber. The list is not exhaustive. The displacement of fluid by the damper body from the damper chamber when opening the check valve has the effect that an opening movement of the check valve is damped.
Die Unteransprüche haben vorteilhafte Ausgestaltungen und Weiterbildungen der im Anspruch 1 angegebenen Erfindung zum Gegenstand. The dependent claims have advantageous refinements and developments of the invention specified in claim 1 to the subject.
Damit sich der Absperrkörper beim Schließen des Rückschlagventils am Ventilsitz ausrichtet ist er quer zur Öffnungs- und Schließrichtung beweglich. Es kann der Absperrkörper gegenüber dem Dämpferkörper (Anspruch 3) und/oder der Dämpferkörper mit dem Absperrkörper quer zur Öffnungs- und Schließrichtung beweglich sein (Anspruch 4). So that the shut-off body aligns when closing the check valve on the valve seat, it is movable transversely to the opening and closing direction. It may be the shut-off against the damper body (claim 3) and / or the damper body with the shut-off transversely to the opening and closing direction to be movable (claim 4).
Insbesondere ist das erfindungsgemäße Rückschlagventil als Auslassventil der Kolbenpumpe vorgesehen (Anspruch 8) und an einem exzenterfernen Ende eines Zylinders der Kolbenpumpe angeordnet. In particular, the check valve according to the invention is provided as an outlet valve of the piston pump (claim 8) and arranged at an eccentric end of a cylinder of the piston pump.
Kurze Beschreibung der Zeichnung Short description of the drawing
Die Erfindung wird nachfolgend anhand in der Zeichnung dargestellter Ausführungsformen näher erläutert. Es zeigen: The invention will be explained in more detail with reference to embodiments shown in the drawing. Show it:
Figur 1 einen Achsschnitt einer Kolbenpumpe gemäß der Erfindung; und Figur 2 eine geänderte Ausführungsform der Kolbenpumpe aus Figur 1 gemäß der Erfindung 1 shows an axial section of a piston pump according to the invention; and Figure 2 shows a modified embodiment of the piston pump of Figure 1 according to the invention
Ausführungsformen der Erfindung Embodiments of the invention
Die in Figur 1 dargestellte, erfindungsgemäße Kolbenpumpe 1 ist als sog. Rückförderpumpe für eine schlupfgeregelte, hydraulische Fahrzeugbremsanlage vorgesehen. Sie weist einen Pumpenkolben 2 auf, der in einem Zylinder 3 axial verschieblich aufgenommen ist. Ein aus dem Zylinder 3 vorstehendes Stirnende des Pumpenkolbens 2 liegt an einem Umfang eines rotierend antreibbaren Exzenters 4 an, der den Pumpenkolben 2 zu einer im Zylinder 3 hin- und hergehenden Hubbewegung antreibt, wenn der Exzenter 4 rotierend angetrieben wird. Eine Kolbenfeder 5, die im Zylinder 3 angeordnet ist, hält den Pumpenkolben 2 in Anlage am Umfang des Exzenters 4. The illustrated in Figure 1, the inventive piston pump 1 is provided as a so-called. Return pump for a slip-controlled, hydraulic vehicle brake system. It has a pump piston 2 which is received in an axially displaceable manner in a cylinder 3. A protruding from the cylinder 3 front end of the pump piston 2 abuts a circumference of a rotatably driven eccentric 4, which drives the pump piston 2 reciprocating in the cylinder 3 reciprocating stroke movement when the eccentric 4 is driven to rotate. A piston spring 5, which is arranged in the cylinder 3, holds the pump piston 2 in contact with the circumference of the eccentric 4th
Der Zylinder 3 ist in eine Pumpenbohrung 6 in einem Pumpengehäuse 7 eingebracht, die Pumpenbohrung 6 führt den Pumpenkolben 2 an einem aus dem Zylinder 3 vorstehenden, exzenternahen Ende axial verschieblich. The cylinder 3 is introduced into a pump bore 6 in a pump housing 7, the pump bore 6 leads the pump piston 2 at a protruding from the cylinder 3, the eccentric end axially displaceable.
Die Kolbenpumpe 1 kann ein separates Pumpengehäuse 7 aufweisen. Bei der dargestellten Ausführungsform der Erfindung wird das Pumpengehäuse 7 von einem Hydraulikblock gebildet, in dem außer der Kolbenpumpe 1 weitere hydraulische Bauelemente wie Magnetventile einer Schlupfregelung der hydraulischen Fahrzeugbremsanlage angeordnet und durch Bohrungen hydraulisch miteinander verschaltet sind. Solche Hydraulikblöcke sind von schlupfgeregelten Fahrzeugbremsanlagen bekannt und sollen hier nicht weiter erläutert werden. The piston pump 1 may have a separate pump housing 7. In the illustrated embodiment of the invention, the pump housing 7 is formed by a hydraulic block in which in addition to the piston pump 1 further hydraulic components such as solenoid valves of a slip control of the hydraulic vehicle brake system arranged and interconnected by holes hydraulically. Such hydraulic blocks are known from slip-controlled vehicle brake systems and will not be explained further here.
Ein Einlass 8 der Kolbenpumpe 1 erfolgt durch eine Bohrung, die die Pumpenbohrung 6 radial außerhalb des Zylinders 3 kreuzt. Weiter führt der Einlass 8 durch einander kreuzende Radialbohrungen 9 in ein axiales Sackloch 10 im Pumpenkolben 2. Ein in der Zeichnung als Symbol dargestelltes Einlassventil 1 1 ist in Pumpenkolben 2 integriert oder an dessen im Zylinder 3 befindlichen Stirnende angeordnet. Das Einlassventil 1 1 ist ein federbelastetes Rückschlagventil. An inlet 8 of the piston pump 1 takes place through a bore which intersects the pump bore 6 radially outside the cylinder 3. Further, the inlet 8 leads through intersecting radial bores 9 in an axial blind hole 10 in the pump piston 2. An inlet valve 1 1 shown as a symbol in the drawing is integrated in the pump piston 2 or arranged at its front end located in the cylinder 3. The inlet valve 1 1 is a spring-loaded check valve.
Der Zylinder 3 weist einen Boden 12 auf, an dem sich die Kolbenfeder 5 abstützt. Der Boden 12 weist ein Mittelloch auf, das einen Durchläse 13 eines Auslass- ventils 14 der Kolbenpumpe 1 bildet. Das Auslassventil 14 ist in einem Sackloch 15 eines Zylinderkopfes 16 angeordnet, der auf den Boden 12 des Zylinders 13 aufgesetzt ist. Der Zylinderkopf 16 bildet ein Ventilgehäuse des Auslassventils 14. The cylinder 3 has a bottom 12, on which the piston spring 5 is supported. The bottom 12 has a center hole, which has a passage 13 of an outlet valve 14 of the piston pump 1 forms. The exhaust valve 14 is arranged in a blind hole 15 of a cylinder head 16, which is placed on the bottom 12 of the cylinder 13. The cylinder head 16 forms a valve housing of the exhaust valve 14.
Das Auslassventil 14 ist ein federbelastetes Rückschlagventil mit einem pilzförmigen Absperrkörper 17. Der Absperrkörper 17 weist einen Kopf 18 mit einer kugelförmigen Fläche auf, die mit einem konischen Ventilsitz 19 zusammenwirkt, die an einer Mündung des Durchläse 13 im Boden 12 des Zylinder 3 ausgebildet ist. An einer flachen Unterseite des Kopfs 18 weist der Absperrkörper 17 einenThe outlet valve 14 is a spring-loaded check valve with a mushroom-shaped shut-off body 17. The shut-off body 17 has a head 18 with a spherical surface, which cooperates with a conical valve seat 19 which is formed at an opening of the passage 13 in the bottom 12 of the cylinder 3. On a flat underside of the head 18, the shut-off 17 has a
Schaft 20 auf. Shank 20 on.
Der Schaft 20 des Absperrkörpers 17 durchgreift ein Mittelloch 21 in einer Stirnwand 22 eines rohrförmigen Dämpferkörpers 23. Der Schaft 20 des Absperr- körpers 17 des Auslassventil 14 weist einen kleineren Durchmesser als MittellochThe shaft 20 of the shut-off body 17 passes through a center hole 21 in an end wall 22 of a tubular damper body 23. The shaft 20 of the shut-off body 17 of the outlet valve 14 has a smaller diameter than the central hole
21 in der Stirnwand 22 des Dämpferkörpers 23 auf. Dadurch ist der Absperrkörper 17 quer zu seiner Öffnungs- und Schließrichtung, d. h. radial zum Zylinder 3, beweglich und richtet sich beim Schließen des Auslassventils 14 am Ventilsitz 19 aus. Ein etwaiger Versatz des Durchläse 13 mit dem Ventilsitz 19 in Bezug auf den das Ventilgehäuse bildenden Zylinderkopf 16 wird ausgeglichen. 21 in the end wall 22 of the damper body 23. As a result, the shut-off body 17 is transverse to its opening and closing direction, d. H. radially to the cylinder 3, movable and aligns when closing the exhaust valve 14 on the valve seat 19. Any displacement of the passage 13 with the valve seat 19 with respect to the valve housing forming cylinder head 16 is compensated.
Eine Ventilschließfeder 24, die in der dargestellten Ausführungsform der Erfindung als Schraubendruckfeder ausgebildet ist, beaufschlagt den Dämpferkörper 23 und über diesen den Absperrkörper 17 gegen den Ventilsitz 19. Die Ventilschließfeder 24 stützt sich an einem Grund des Sacklochs 15 im Zylinderkopf 16 ab. A valve closing spring 24, which is formed in the illustrated embodiment of the invention as a helical compression spring, acts on the damper body 23 and on this the shut-off 17 against the valve seat 19. The valve closing spring 24 is supported on a bottom of the blind hole 15 in the cylinder head 16.
Verdrängt der Pumpenkolben 2 bei einem Hub in Richtung des Bodens 12 des Zylinders 3 Bremsflüssigkeit aus dem Zylinder 3, wird der Absperrkörper 17 vom Ventilsitz 19 abgehoben und das Auslassventil 14 auf diese Weise geöffnet. DerDisplaced, the pump piston 2 at a stroke in the direction of the bottom 12 of the cylinder 3 brake fluid from the cylinder 3, the shut-off 17 is lifted from the valve seat 19 and the exhaust valve 14 is opened in this manner. Of the
Dämpferkörper 23 bewegt sich mit dem Absperrkörper 17 mit, wobei der Absperrkörper 17 gegenüber dem Dämpferkörper 23 beweglich ist. Beim Öffnen des Auslassventils 14 wird der Dämpferkörper 23 in das Sackloch 15 im Zylinderkopf 16 hineingedrückt und verdrängt Bremsflüssigkeit aus dem Sackloch 15 durch einen den Dämpferkörper 23 im Sackloch 15 umgebenden Ringspalt 25.Damper body 23 moves with the shut-off 17, wherein the shut-off body 17 relative to the damper body 23 is movable. When opening the exhaust valve 14, the damper body 23 is pressed into the blind hole 15 in the cylinder head 16 and displaces brake fluid from the blind hole 15 by an annular gap 25 surrounding the damper body 23 in the blind hole 15.
Die Verdrängung von Bremsflüssigkeit aus dem Sackloch 15 bewirkt eine Dämp- fung der Öffnungsbewegung des Auslassventils 14. Das Sackloch 15 kann wegen seiner die Öffnungsbewegung des Auslassventils 14 im Zusammenwirken mit dem Dämpferkörper 23 dämpfenden Wirkung auch als Dämpferkammer 26, der Dämpferkörper 23 auch als Dämpferkolben 27 aufgefasst werden. The displacement of brake fluid from the blind hole 15 causes a damping The blind hole 15 can be considered as a damper chamber 26, the damper body 23 as a damper piston 27 because of its the opening movement of the exhaust valve 14 in cooperation with the damper body 23 damping effect.
Durch das Auslassventil 14 aus der Kolbenpumpe 1 verdrängte Bremsflüssigkeit strömt durch radiale Auslasskanäle 28 in eine Ringleitung 29 und von dort in einen Auslass 30, der radial im Pumpengehäuse 7 in die Pumpenbohrung 6 mündet. Der Ringkanal 29 ist zwischen dem Zylinder 3 und der Pumpenbohrung 6 eingeschlossen, er umschließt den Zylinder 3 nahe seines auslassventilseitigenBrake fluid displaced by the outlet valve 14 from the piston pump 1 flows through radial outlet channels 28 into a ring line 29 and from there into an outlet 30, which opens radially into the pump bore 6 in the pump housing 6. The annular channel 29 is enclosed between the cylinder 3 and the pump bore 6, it encloses the cylinder 3 near its outlet valve side
Endes. End.
Die Pilzform des Absperrkörpers 17 des Auslassventils 14 ist nicht zwingend für die Erfindung, der Absperrkörper kann beispielsweise auch die Form einer Halb- kugel oder Kugel oder eine Scheibe aufweisen. Figur 2 zeigt eine weitere Alternative mit einem zylindrischen Absperrkörper 31 , der eine kugelförmige Stirnfläche 32 aufweist, die mit dem konischen Ventilsitz 19 an der Mündung des Durchläse 13 im Boden 12 des Zylinders 3 zusammenwirkt. Bei geschlossenem Auslassventil 14 liegt die kugelförmige Stirnfläche 32 des Absperrkörpers 31 am Ventilsitz 19 an. The mushroom shape of the shut-off body 17 of the outlet valve 14 is not mandatory for the invention, the shut-off body may for example also have the shape of a hemisphere or ball or a disc. Figure 2 shows a further alternative with a cylindrical shut-off body 31 which has a spherical end face 32 which cooperates with the conical valve seat 19 at the mouth of the passage 13 in the bottom 12 of the cylinder 3. When the outlet valve 14 is closed, the spherical end face 32 of the shut-off body 31 bears against the valve seat 19.
Der Absperrkörper 31 ist in einem rohrförmigen Dämpferkörper 33 aufgenommen, der auch als Dämpferkolben aufgefasst werden kann. Der Absperrkörper 31 ist im Dämpferkörper 33 axial verschieblich, d.h. in Öffnungs- und Schließrichtung beweglich. Radial, d. h. quer zur Öffnungs- und Schließrichtung, ist der Absperrkörper 31 im Dämpferkörper 33 im Gegensatz zu Figur 1 nicht beweglich. Radial, d. h. quer zur Öffnungs- und Schließrichtung ist in Figur 2 allerdings der Dämpferkörper 33 und mit ihm zusammen der Absperrkörper 31 beweglich durch Spiel im Sackloch 15 im Zylinderkopf 16, wobei das Sackloch 15 auch hier eine Dämpferkammer 26 bildet. Das Sackloch 15 weist einen größerenThe shut-off body 31 is received in a tubular damper body 33, which can also be understood as a damper piston. The shut-off body 31 is axially displaceable in the damper body 33, i. movable in the opening and closing direction. Radial, d. H. transverse to the opening and closing direction, the shut-off body 31 in the damper body 33, in contrast to Figure 1 is not movable. Radial, d. H. transverse to the opening and closing direction in Figure 2, however, the damper body 33 and together with it the shut-off body 31 movable by play in the blind hole 15 in the cylinder head 16, wherein the blind hole 15 forms a damper chamber 26 here. The blind hole 15 has a larger one
Durchmesser als der Dämpferkörper 33 auf, so dass ein den Dämpferkörper 33 umschließender Ringspalt 25 zwischen dem Dämpferkörper 33 und einer Wand des Sacklochs 15 im Zylinderkopf 16 besteht. Dadurch ist eine Ausrichtung der kugelförmigen Stirnfläche 32 des Absperrkörpers 31 am Ventilsitz 19 beim Schließen des Auslassventils 14 möglich. Der Absperrkörper 33 weist einen nach innen stehenden Radialflansch 34 auf, gegen den die Ventilschließfeder 24 drückt. Diameter than the damper body 33, so that the damper body 33 enclosing annular gap 25 between the damper body 33 and a wall of the blind hole 15 in the cylinder head 16 is. As a result, an alignment of the spherical end face 32 of the shut-off body 31 on the valve seat 19 when closing the exhaust valve 14 is possible. The shut-off body 33 has one after inside standing radial flange 34 against which the valve closing spring 24 presses.
Wie in Figur 1 wird auch in Figur 2 beim Öffnen des Auslassventils 14 der Absperrkörper 31 zusammen mit dem Dämpferkörper 33 in das Sackloch 15 gedrückt, das die Dämpferkammer 26 bildet. Dabei verdrängt der Dämpferkörper 33 Bremsflüssigkeit durch den ihn umschließenden Ringspalt 25 aus der Dämpferkammer 26, wodurch die Öffnungsbewegung des Auslassventils 14 in gewünschter Weise gedämpft wird. As in FIG. 1, in FIG. 2, when the outlet valve 14 is opened, the shut-off body 31 together with the damper body 33 is pressed into the blind hole 15, which forms the damper chamber 26. In this case, the damper body 33 displaces brake fluid through the annular gap 25 enclosing it from the damper chamber 26, as a result of which the opening movement of the outlet valve 14 is damped in the desired manner.
Mit Ausnahme der erläuterten Unterschiede ist die Kolbenpumpe 1 aus Figur 2 gleich ausgebildet wie die Kolbenpumpe 1 aus Figur 1 und funktioniert in gleicher Weise. Zur Vermeidung von Wiederholungen werden zur Erläuterung der Figur 2 insoweit die oben stehenden Erläuterungen zu Figur 1 in Bezug genommen. Übereinstimmende Bauteile haben in beiden Figuren gleiche Bezugszahlen. With the exception of the explained differences, the piston pump 1 of Figure 2 is the same design as the piston pump 1 of Figure 1 and works in the same way. In order to avoid repetition, the above explanations to FIG. Matching components have the same reference numbers in both figures.
Ein konischer Ventilsitz 19 ist nicht zwingend für die Erfindung. Der Ventilsitz kann beispielsweise auch von einer umlaufenden Kante an der Mündung des Durchläse 13 gebildet sein (nicht dargestellt). Die Aufzählung ist nicht abschließend. A conical valve seat 19 is not mandatory for the invention. The valve seat may for example also be formed by a peripheral edge at the mouth of the passage 13 (not shown). The list is not exhaustive.

Claims

Ansprüche claims
1. Kolbenpumpe für eine hydraulische Fahrzeugbremsanlage, mit einem Pumpenkolben (2), der zu einer hin- und hergehenden Hubbewegung antreibbar ist, und mit mindestens einem federbelasteten Rückschlagventil (14), das eine Durchströmungsrichtung durch die Kolbenpumpe (1 ) steuert, wobei das Rückschlagventil (14) einen Ventilsitz (19), einen Absperrkörper (17; 31 ) und eine Ventilschließfeder (24) aufweist, die den Absperrkörper (17; 31 ) gegen den Ventilsitz (19) beaufschlagt, dadurch gekennzeichnet, dass der Absperrkörper (17; 31 ) einen Dämpferkörper (23; 33) aufweist, mit dem zusammen er beim Öffnen des Rückschlagventils (14) vom Ventilsitz (19) abgehoben und mit dem zusammen er von der Ventilschließfeder (24) gegen den Ventilsitz (19) beaufschlagt wird, dass der Absperrkörper (17; 31 ) in Öff- nungs- und Schließrichtung gegenüber dem Dämpferkörper (17; 31 ) beweglich ist, dass der Dämpferkörper (23; 33) in einer Dämpferkammer (26) aufgenommen ist, aus der er beim Öffnen des Rückschlagventils (14) Fluid verdrängt, und dass der Absperrkörper (17; 31 ) quer zu seiner Öffnungs- und Schließrichtung beweglich ist zum Zweck eines Ausrichtens am Ventilsitz (19) beim Schließen des Rückschlagventils (4). A piston pump for a hydraulic vehicle brake system, comprising a pump piston (2) which is drivable for reciprocating stroke movement, and at least one spring-loaded check valve (14) controlling a flow direction through the piston pump (1), the check valve (14) has a valve seat (19), a shut - off body (17, 31) and a valve closing spring (24) which acts on the shut - off body (17, 31) against the valve seat (19), characterized in that the shut - off body (17, 31 Having a damper body (23, 33), with which he together when opening the check valve (14) lifted from the valve seat (19) and with which he is acted upon by the valve closing spring (24) against the valve seat (19) that the shut-off (17; 31) in the opening and closing direction relative to the damper body (17; 31) is movable, that the damper body (23; 33) is received in a damper chamber (26), from which he at m opening the check valve (14) fluid displaced, and that the shut-off body (17; 31) is movable transversely to its opening and closing direction for the purpose of alignment with the valve seat (19) when closing the check valve (4).
2. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass die Ventilschließfeder (24) den Dämpferkörper (23; 33) beaufschlagt. 2. Piston pump according to claim 1, characterized in that the valve closing spring (24) the damper body (23, 33) acted upon.
3. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass der Absperrkörper (17; 31 ) gegenüber dem Dämpferkörper (23; 33) quer zur Öffnungs- und Schließrichtung beweglich ist. 3. Piston pump according to claim 1, characterized in that the shut-off body (17, 31) relative to the damper body (23, 33) is movable transversely to the opening and closing direction.
4. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass der Dämpferkörper (23; 33) quer zu Öffnungs- und Schließrichtung beweglich ist. 4. Piston pump according to claim 1, characterized in that the damper body (23; 33) is movable transversely to the opening and closing direction.
5. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass der Absperrkörper (17) pilzförmig mit einem Kopf (18), der bei geschlossenem Rückschlagventil (14) am Ventilsitz (19) anliegt, und mit einem Schaft (20) zur Führung des Absperrkörpers (17) ist. 5. Piston pump according to claim 1, characterized in that the shut-off body (17) mushroom-shaped with a head (18) when closed Check valve (14) on the valve seat (19) is applied, and with a shaft (20) for guiding the shut-off (17).
6. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass der Absperrkörper (31 ) eine über seine Länge gleichbleibende Querschnittsfläche und eine kugelförmige Stirnfläche (32) aufweist, die bei geschlossenem Rückschlagventil (14) am Ventilsitz (19) anliegt. 6. Piston pump according to claim 1, characterized in that the shut-off body (31) has a constant over its length cross-sectional area and a spherical end face (32) which rests with closed check valve (14) on the valve seat (19).
7. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass der Dämpferkörper (23; 33) rohrförmig ist. 7. Piston pump according to claim 1, characterized in that the damper body (23; 33) is tubular.
8. Kolbenpumpe nach Anspruch 1 , dadurch gekennzeichnet, dass das Rückschlagventil (14) ein Auslassventil (14) der Kolbenpumpe 1 ist. 8. Piston pump according to claim 1, characterized in that the check valve (14) is an outlet valve (14) of the piston pump 1.
EP10778914.1A 2009-12-23 2010-10-28 Piston pump for an hydraulic vehicle braking system Active EP2516857B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009055228A DE102009055228A1 (en) 2009-12-23 2009-12-23 Piston pump for a hydraulic vehicle brake system
PCT/EP2010/066302 WO2011076467A1 (en) 2009-12-23 2010-10-28 Piston pump for a hydraulic vehicle braking system

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EP2516857A1 true EP2516857A1 (en) 2012-10-31
EP2516857B1 EP2516857B1 (en) 2013-07-31

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US (1) US9140257B2 (en)
EP (1) EP2516857B1 (en)
JP (1) JP5677459B2 (en)
KR (1) KR101793892B1 (en)
CN (1) CN102686883B (en)
DE (1) DE102009055228A1 (en)
WO (1) WO2011076467A1 (en)

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JP5677459B2 (en) 2015-02-25
EP2516857B1 (en) 2013-07-31
KR101793892B1 (en) 2017-11-06
US20120263613A1 (en) 2012-10-18
US9140257B2 (en) 2015-09-22
JP2013515190A (en) 2013-05-02
DE102009055228A1 (en) 2011-06-30
WO2011076467A1 (en) 2011-06-30
CN102686883B (en) 2015-07-15
CN102686883A (en) 2012-09-19
KR20120096035A (en) 2012-08-29

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